hw/arm/raspi.c

   1 /*
   2  * Raspberry Pi emulation (c) 2012 Gregory Estrade
   3  * Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous
   4  *
   5  * Rasperry Pi 2 emulation Copyright (c) 2015, Microsoft
   6  * Written by Andrew Baumann
   7  *
   8  * This code is licensed under the GNU GPLv2 and later.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "hw/arm/bcm2836.h"
  13 #include "qemu/error-report.h"
  14 #include "hw/boards.h"
  15 #include "hw/loader.h"
  16 #include "hw/arm/arm.h"
  17 #include "sysemu/sysemu.h"
  18
  19 #define SMPBOOT_ADDR    0x300 /* this should leave enough space for ATAGS */
  20 #define MVBAR_ADDR      0x400 /* secure vectors */
  21 #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
  22 #define FIRMWARE_ADDR   0x8000 /* Pi loads kernel.img here by default */
  23
  24 /* Table of Linux board IDs for different Pi versions */
  25 static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43};
  26
  27 typedef struct RasPiState {
  28     BCM2836State soc;
  29     MemoryRegion ram;
  30 } RasPiState;
  31
  32 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
  33 {
  34     static const uint32_t smpboot[] = {
  35         0xe1a0e00f, /*    mov     lr, pc */
  36         0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
  37         0xee100fb0, /*    mrc     p15, 0, r0, c0, c0, 5;get core ID */
  38         0xe7e10050, /*    ubfx    r0, r0, #0, #2       ;extract LSB */
  39         0xe59f5014, /*    ldr     r5, =0x400000CC      ;load mbox base */
  40         0xe320f001, /* 1: yield */
  41         0xe7953200, /*    ldr     r3, [r5, r0, lsl #4] ;read mbox for our core*/
  42         0xe3530000, /*    cmp     r3, #0               ;spin while zero */
  43         0x0afffffb, /*    beq     1b */
  44         0xe7853200, /*    str     r3, [r5, r0, lsl #4] ;clear mbox */
  45         0xe12fff13, /*    bx      r3                   ;jump to target */
  46         0x400000cc, /* (constant: mailbox 3 read/clear base) */
  47     };
  48
  49     /* check that we don't overrun board setup vectors */
  50     QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
  51     /* check that board setup address is correctly relocated */
  52     QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
  53                       || (BOARDSETUP_ADDR >> 4) >= 0x100);
  54
  55     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  56                        info->smp_loader_start);
  57 }
  58
  59 static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
  60 {
  61     arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
  62 }
  63
  64 static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
  65 {
  66     CPUState *cs = CPU(cpu);
  67     cpu_set_pc(cs, info->smp_loader_start);
  68 }
  69
  70 static void setup_boot(MachineState *machine, int version, size_t ram_size)
  71 {
  72     static struct arm_boot_info binfo;
  73     int r;
  74
  75     binfo.board_id = raspi_boardid[version];
  76     binfo.ram_size = ram_size;
  77     binfo.nb_cpus = smp_cpus;
  78     binfo.board_setup_addr = BOARDSETUP_ADDR;
  79     binfo.write_board_setup = write_board_setup;
  80     binfo.secure_board_setup = true;
  81     binfo.secure_boot = true;
  82
  83     /* Pi2 requires SMP setup */
  84     if (version == 2) {
  85         binfo.smp_loader_start = SMPBOOT_ADDR;
  86         binfo.write_secondary_boot = write_smpboot;
  87         binfo.secondary_cpu_reset_hook = reset_secondary;
  88     }
  89
  90     /* If the user specified a "firmware" image (e.g. UEFI), we bypass
  91      * the normal Linux boot process
  92      */
  93     if (machine->firmware) {
  94         /* load the firmware image (typically kernel.img) */
  95         r = load_image_targphys(machine->firmware, FIRMWARE_ADDR,
  96                                 ram_size - FIRMWARE_ADDR);
  97         if (r < 0) {
  98             error_report("Failed to load firmware from %s", machine->firmware);
  99             exit(1);
 100         }
 101
 102         binfo.entry = FIRMWARE_ADDR;
 103         binfo.firmware_loaded = true;
 104     } else {
 105         binfo.kernel_filename = machine->kernel_filename;
 106         binfo.kernel_cmdline = machine->kernel_cmdline;
 107         binfo.initrd_filename = machine->initrd_filename;
 108     }
 109
 110     arm_load_kernel(ARM_CPU(first_cpu), &binfo);
 111 }
 112
 113 static void raspi2_init(MachineState *machine)
 114 {
 115     RasPiState *s = g_new0(RasPiState, 1);
 116
 117     object_initialize(&s->soc, sizeof(s->soc), TYPE_BCM2836);
 118     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
 119                               &error_abort);
 120
 121     /* Allocate and map RAM */
 122     memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
 123                                          machine->ram_size);
 124     /* FIXME: Remove when we have custom CPU address space support */
 125     memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
 126
 127     /* Setup the SOC */
 128     object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
 129                                    &error_abort);
 130     object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus",
 131                             &error_abort);
 132     object_property_set_int(OBJECT(&s->soc), 0xa21041, "board-rev",
 133                             &error_abort);
 134     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
 135
 136     setup_boot(machine, 2, machine->ram_size);
 137 }
 138
 139 static void raspi2_machine_init(MachineClass *mc)
 140 {
 141     mc->desc = "Raspberry Pi 2";
 142     mc->init = raspi2_init;
 143     mc->block_default_type = IF_SD;
 144     mc->no_parallel = 1;
 145     mc->no_floppy = 1;
 146     mc->no_cdrom = 1;
 147     mc->max_cpus = BCM2836_NCPUS;
 148
 149     /* XXX: Temporary restriction in RAM size from the full 1GB. Since
 150      * we do not yet support the framebuffer / GPU, we need to limit
 151      * RAM usable by the OS to sit below the peripherals.
 152      */
 153     mc->default_ram_size = 0x3F000000; /* BCM2836_PERI_BASE */
 154 };
 155 DEFINE_MACHINE("raspi2", raspi2_machine_init)